Added some missing prototypes.
Define the HDRAWDIB handle type.

diff --git a/include/ddeml.h b/include/ddeml.h
index 1a9dc3f..18c183f 100644
--- a/include/ddeml.h
+++ b/include/ddeml.h
@@ -328,10 +328,12 @@
                                         UINT16,DWORD,LPDWORD);
 HDDEDATA  WINAPI DdeClientTransaction(LPBYTE,DWORD,HCONV,HSZ,UINT,
                                         UINT,DWORD,LPDWORD);
+BOOL      WINAPI DdeImpersonateClient(HCONV);
 BOOL16    WINAPI DdeAbandonTransaction16(DWORD,HCONV,DWORD);
 BOOL16    WINAPI DdePostAdvise16(DWORD,HSZ,HSZ);
 BOOL    WINAPI DdePostAdvise(DWORD,HSZ,HSZ);
 HDDEDATA  WINAPI DdeAddData16(HDDEDATA,LPBYTE,DWORD,DWORD);
+HDDEDATA  WINAPI DdeAddData(HDDEDATA,LPBYTE,DWORD,DWORD);
 DWORD     WINAPI DdeGetData(HDDEDATA,LPBYTE,DWORD,DWORD);
 LPBYTE    WINAPI DdeAccessData16(HDDEDATA,LPDWORD);
 LPBYTE    WINAPI DdeAccessData(HDDEDATA,LPDWORD);
@@ -341,6 +343,7 @@
 BOOL    WINAPI DdeEnableCallback(DWORD,HCONV,UINT);
 INT16     WINAPI DdeCmpStringHandles16(HSZ,HSZ);
 INT       WINAPI DdeCmpStringHandles(HSZ,HSZ);
+BOOL      WINAPI DdeSetUserHandle(HCONV,DWORD,DWORD);
 
 HDDEDATA  WINAPI DdeNameService16(DWORD,HSZ,HSZ,UINT16);
 HDDEDATA  WINAPI DdeNameService(DWORD,HSZ,HSZ,UINT);